Unit: Electricity and Magnetism
Year: 1996 Question#: 30
Question:
In the circuit shown above, voltmeter V2 reads 80. volts. What is the reading of voltmeter V1?
(1 ) 160 V
(2 ) 80 V
(3 ) 40 V
(4 ) 20 V
What is this question really asking?
Explanation by: Jay D (no last names)
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Answer 1
160 V
CORRECT
V=IR
R=V/I V1/R1=V2/R2 V1=V2R1/R2 V1=(80 v)(40
)/20
= 160 v
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Answer 2
80 v
INCORRECT
You probably forgot to divide by the 20
for the second voltmeter
return to top Answer 3
40 v
INCORRECT
Remember the current through both resistors is the same. return to top
Answer 4
20 v
INCORRECT
You probably forgot to multiply by 80 v on the top Remember the current through both resistors is the same. return to top
What's this question really asking?
This question is asking to find the reading of a voltmeter in a series circuit given the resistance and current flow. return to top
